Numerical simulation of optimization of volume fracturing parameters for horizontal wells in tight oil

Abstract

ABSTRACT A comprehensive workflow for optimizing the fracturing parameters of horizontal wells in tight oil reservoirs is demonstrated. A numerical simulation model with geologic characterization data from Cangdong Sag Basin reservoirs was constructed. Geometrical parameters of the fractures were calculated through a volumetric model of the fracture network. The fracture lengths, heights, and network radius were optimized using dynamic local grid refinement. The equivalent stimulated reservoir volume considering fracture propagation was then simulated. Based on the simulation results of the mechanism model, after considering factors such as interfracture interference, fracturing operation duration, cost, and construction safety, the following optimal ranges of fracturing parameters are recommended: number of fracturing fractures = 8–11 levels, half-length of fracturing fractures = 130–160 m, and conductivity of fracturing fractures = 14–20 D∙cm. Based on the actual situation of the work area, it is recommended that the number of fracturing fractures be 9, the half-length of the fracture be 150 m, and the fracture conductivity be 18 D∙cm to achieve higher horizontal well production and provide a certain data reference for the efficient development of similar dense oil reservoirs.